Question: What was Berkshire Hathaway's total revenue in 2015?
Paraphrase: In 2015, what was the total revenue of Berkshire Hathaway?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q217583 p:P2139 ?s . ?s ps:P2139 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2015')) }